gennarocuccovillo

Hello everybody.I have a little "simple" question for all the guests:I noted that to get up and get down a general digital line on ARDUINO DUE need a time of about 2.5 microsecs, using the digitlaWrite() function. So my questions is: Are we sure that the clock frequency of the board is 86 MHz? Which is the proof?In addiction I need to know if there are any possibilities to access directly to the PLL register of the microcontroller to set the clock frequency at the maximum rate.Thank to all in advance